Design method for dual-band filters with completely independent passbands

Taejun Lim, Jungje Ha, Seungku Lee, Yongshik Lee

Research output: Contribution to journalArticle

Abstract

A design method for transmission-line-based dual-band filters with completely independent passbands is demonstrated. The proposed method completely ignores the conventional restrictions imposed on the electrical lengths of the transmission lines. Consequently, each resonator is designed separately by the predetermined parameters. Unlike conventional dual-band filters, the susceptance slope parameters at two center frequencies do not need to be maintained in all sections. As a result, the proposed filter can be designed to not only have different bandwidths, but also different responses. In addition, tuning the J-inverter values increases the design’s flexibility and compensate the theoretical limitation. The experimental results for various filters verify the proposed method, including the outstanding passband insertion loss. For the first time, a filter with a Chebyshev response in one passband and a maximally flat time-delay response in the other is demonstrated in this work.

Original languageEnglish
Pages (from-to)1735-1748
Number of pages14
JournalJournal of Electromagnetic Waves and Applications
Volume33
Issue number13
DOIs
Publication statusPublished - 2019 Sep 2

Fingerprint

Electric lines
filters
Insertion losses
Resonators
Time delay
Tuning
transmission lines
Bandwidth
insertion loss
constrictions
flexibility
time lag
resonators
tuning
slopes
bandwidth

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

Cite this

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abstract = "A design method for transmission-line-based dual-band filters with completely independent passbands is demonstrated. The proposed method completely ignores the conventional restrictions imposed on the electrical lengths of the transmission lines. Consequently, each resonator is designed separately by the predetermined parameters. Unlike conventional dual-band filters, the susceptance slope parameters at two center frequencies do not need to be maintained in all sections. As a result, the proposed filter can be designed to not only have different bandwidths, but also different responses. In addition, tuning the J-inverter values increases the design’s flexibility and compensate the theoretical limitation. The experimental results for various filters verify the proposed method, including the outstanding passband insertion loss. For the first time, a filter with a Chebyshev response in one passband and a maximally flat time-delay response in the other is demonstrated in this work.",
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Design method for dual-band filters with completely independent passbands. / Lim, Taejun; Ha, Jungje; Lee, Seungku; Lee, Yongshik.

In: Journal of Electromagnetic Waves and Applications, Vol. 33, No. 13, 02.09.2019, p. 1735-1748.

Research output: Contribution to journalArticle

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